I have a piece of code which pickled by pypy, however, pypy add its own opcode to extend the cpython opcode, which caot be unpickled by cpython(raise SystemError: unknown opcode).
It's caused by the special opcode: LOOKUP_METHOD & CALL_METHOD, just refer to the pypy doc
I am wondering how to make pypy generate exactly the standard cpython bytecode instead of the self defined bytecode. I look around the docs, and found the PYTHONOPTIMIZE environment variable, and I set it to 0, but it does not work.
p.s. I caot change the unpickle side, it has to be cpython 2.7.